Don't kick off the threads until the queue is full

The idea is as follows: Initially let the user submit blocks until the
queue is filled, then kick of the threads. Every thread will end up
getting a block without any waits until they completely deplete the
queue. Assuming the threads take longer to process the data than it
takes the main thread to do I/O and submit new blocks, the queue should
stay mostly filled with minimal wait times.

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>

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